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Chlorine has 7, so it will gain an electron and have a full (8-electron) outer shell.\n. \nThere must therefore be two chlorines for every magnesium: each chlorine accepts one of the two electrons donated by magnesium. Magnesium forms two ionic bonds: one to each chloride ion. read more
1) When a metal and a nonmetal bond, the metal ion "gives" its valence electrons to the anion to form an ionic bond. Magnesium is a metal (group 2/alkaline earth metals), while chlorine is a nonmetal (group 7/halogen). Therefore, because magnesium and chlorine do not share electrons, they do not form a covalent bond. read more